Improvement in combined knob-latoe and look



M. B. FOOTE, OF NEW ENGLAND VILLAGE,l MASSACHUSETTS, ASSIGNOR TO HIMSELFAND E.,N. FOUTE-OF .THE SAME PLAGE.

Letters Patent No. 70,081, dated October 22, 1867.

IMPROVEMENT IN (lOMBINED KNOB-LATCH AND LOCK.

TO ALL WI'IOM IT MAY CONCERN:

Be it known that I, MONROE B. FOOTE, of New England Village, in thecounty of Worcester, and State of Massachusetts, have invented a new'andimproved Combined Lock and Latch; and I do hereby declare that thefollowing is a full, clear, and exact description ofthe same,refe1"enccbeing had to the accompanying drawings, forming part oi thisspecification, and in whichi i Figure 1 is a longitudinal sectionthrough the centre of my combined lock and latch.

Figure 2 is a vertical section through the centre of the same, showingparticularly the opera-tion' of thelock.

Figure 3 is a side Velevation of the whole instrument. y

Similar letters of reference' indicate corresponding parts in theseveral figures.

This invention consists in combining the common spring door-latch with alock situated inside ofthe latchcase in a slot in the latch-bolt, .intoone side of which its bolt locks.

The case which contains the-mechanism of this combined lock and latch isin the form ota round cylinder or barrel, about four inches in lengthand one inch or less in diameter, so that it can readily be insertedinto an auger-hole bored forthe purpose in the edge of the door. At theextremity through which the latch-bolt operates the case is attached toa plate which is designed to be screwed to the edge of the door.

In the drawings, A represents the barrel of the latch containing thevarious parts of the mechanism hereinafterdescribed. B is the latch-boltsliding longitudinally in the barael A, its bevelled extremityprojecting from the end of the barrel, and its opposite extremityconnected by a chain, C, with the hub or roller which bears thedoor-knob. A wide slot is cut in the latch-bolt, extending nearly itsentire length. In this slot is placed a small lock, D, which is firmlyattached to the barrel A by `pins or bolts or any other suitable means.A spiral spring, E, is also placed in the slot, one end of which hearsagainst the fixed lock D, and the other against the wall'iwthelatch atth'eui'rlont'extremity of the slot. The latch-bolt thus constructedslides freely back and forth pastthc iiired lock D when the latter isunlocked. In the inner side of the latch-holt Bvin the wall of the slot,and directlyin front of the bolt F of the lock., is a mortise into whichthe bolt F entersivhen the door is locked, preventing. thev bolt B frommoving in any directionf. The parts of the fixed lock D are clearlyshown in iig. 2, in which G is the key, His the tumbler, and F the bolt.

I do not desire to limit myself to this particular way of constructingthe inside mechanism of the lock D, but may use any form of lock-thatwill suit the purpose. The construction shown in the drawings, however,admits of close packing, which is essential where thelock is confined inso small a space, and-at the same timeA can be made very strong, andwill not be liable to get out of order.

Theopveration of a combined lock and latch thus constructed is verysimple, convenient, and perfect. To

attach the instrumentto the door no mortising is required, but a simpleauger-hole, deep enough to receive the. I

0 entire length of the barrel A-is all that is needed. A couple ofscrews through the plate K secure the instrument firmly in its place inthe door, and it is then lready for use. The latch, being aspring-latch, closes, of course, by the force of the closing door. It isthen opened by turning the door-knob'L in any' directiomV If it isdesired to lock the door, a turn of 4the key G fixes the latch-boltfirmly to the immovable lock D, and

renders 'it impossible to open the door. a

Instead of the spiral spring E, any other form of spring may be usedthat will answer as well. The chain C I make with swivel-jointsconnecting the links, a form which gives it greater strength with lessliability to rfoul. The barrelA may be made in several 'pieces ifdesired. In my drawings the sides of it are shown as made in two pieces,or being divided longitudinally into two equal sections, these sectionsattached to each other and to the fixed lock D by screws, and havingnotches fitting upon projections in the plate K and the 'end piece onthe opposite end of the barrel, to hold the sections of the side piecesot' the barrel4 more firmly. 'y

Having thusldescribed my invention, what I claim as new, and desireto'sccure by LettersrPatent, is; The latch-bolt B, 'having the wide slotherein described, and having in one of the walls of that slot a mortiseto receive the bolt ofy the lock D, substantially as and for the purposespecified.

l A M. B.` FOOTE.

Witnesses:

W. S. KINGSLEY, VJ. B. AUGUR.

